package mapper;

import org.apache.ibatis.annotations.*;
import pojo.Brand;

import java.util.List;
//数据访问层
//操作数据库的Mapper接口
public interface BrandMapper {
//    查询所有品牌
    @ResultMap("brandResultMap")
    @Select("select * from t_brand")
    List<Brand> selectAll();

//    单个查询
    @ResultMap("brandResultMap")
    @Select("select * from t_brand where id = #{id}")
    Brand selectById(int id);
//    插入一个品牌的方法
    @Insert("insert into t_brand values" +
            "(null,#{brandName},#{companyName},#{ordered}," +
            "#{description},#{status})")
    void add(Brand brand);

//    修改一个品牌
    @Update("update t_brand set brand_name=#{brandName}," +
            "company_name=#{companyName}, ordered=#{ordered}," +
            "description=#{description},status=#{status} where id=#{id}")
    void update(Brand brand);

//    删除一个品牌
    @Delete("delete from t_brand where id=#{id}")
    void deleteById(int id);

//    以下是分页Page查询
//    1.查询某一页数据
    @ResultMap("brandResultMap")
    @Select("SELECT * FROM t_brand LIMIT #{beginIndex},#{pageSize}")
    List<Brand>selectAllPage(@Param("beginIndex")int beginIndex,
                             @Param("pageSize")int pageSize);

//    2.查询总的数据条数
    @Select("SELECT count(1) FROM t_brand")
    int selectCount();
}
